Earlier quoted context omitted.
because the goal of terrorism is awareness that there are evil assholes out there. they want to get caught. the casualties are a means to an end. if you just kill a bunch of people without anyone noticing it, nothings been gained in terms of effective terrorizing. terrorists want to be freddy krueger, not the rollercoaster from final destination.
How is it any different from suicide bombing tho? The terrorist organizations can still take credit for the bus-on-highway-terror just like they take credit posthumously for the suicide bombings.
Why not try to claim they made the malaysian air flight disappear?
I'm not sure, but it doesnt seem to be on their agenda.
Terrorist code of conduct. "Thou shall not claim casualties you didn't cause."